Compression-indicator for calipers.



PATENTED JULY 12, 1904.

INVENTOI? Czarlea afi aauyzg A oe/v5 rs 0. 0. McGLAUGHRY. COMPRESSION INDICATOR FOR GALIPERS.

APPLIUATION FILED AUG. 26, 1903.

N0 MODEL.

WITNESSES:

. UNITED STATES Patented July 12, 1904.

PATENT OFFICE.

COMPRESSION-INDICATOR FOR CALIPERS.

SPECIFICATION forming part of Letters Patent N 0. 765,034, July 12, 1904.

Application filed August 26, 1903.

To all who/12, it may concern:

Be it known that I, CHARLES C. MeCLAUeH- RY, a citizen of the United States, and a resident of Atlanta, in the county of Fulton and State of Georgia, have invented a new and Improved CompressionIndicator for Calipers, of which the following is a full, clear, and exact description.

The purpose of the invention is to provide a scale attachment for calipers and a pointer for the scale automatically carried across the scale as the measurement is taken and automatically returned to zero when the calipers are removed from the object, thus enabling a machinist, for example, to determine by sight when two or more objects are alike.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the calipers and the applied attachment. Fig. 2 is a sectional side elevation of a limb of the calipers and a sectional front elevation of the attachment, the cover-plate being removed from the body of the attachment. Fig. 3 is a plan view of the actuating-bar for the attachment. Fig. 4 is a section taken substantially on the line 4 4 of Fig. 2, and Fig. 5 is a front elevation of the cover-plate for the body of the attachment.

A represents calipers of any approved construction, one limb, 10, whereof at its front or working end is provided with a barrel or tube 11 made integral therewith and extending outward fromthe limb or beyond its outer edge. This barrel or tube forms a portion of the attachment and is connected withthe bodysection B of the attachment. This body-section may be of any suitable or approved form, but preferably is of the shape illustrated, comprising a semicircular section 12 and an intersecting segmental section 13. The said body-section B of the attachment is provided with a chamber 5, extending within bothiof" the sections 12 and 13, and the said chamber is Serial No. 170,818. (No iuodeli closed by a removable plate 14, corresponding in shape to the shape of the body B, as is shown in Fig. 5. Suitable screw-holes 15 are produced in the marginal portion of the chamber 7), and corresponding openings 16 are made in the cover 14, so that the cover may.

with the aforesaid limb 10 of the calipers, and

the corresponding portion of the cover 14 has a cut-away or concaved edge 17 to fit to the outer edge of the said limb of the calipers. The said cover 14 at the convexed edge of its segmental section has a recess 18 made therein, whereby when the cover is on the body B of the attachment a scale 19 is exposed, produced upon a corresponding marginal portion of the body.

The actuating-bar 20 is mounted to slide loosely in the tube or barrel 11, being provided at the end which extends beyond the end of the member 10 of the calipers with a head 21. This actuating-bar extends into the semicircular portion 12 of the body B of the attachment, and at its inner end is provided with a link 22, pivotally attached to the actuating-bar, and to the end of a pointer 23, which is of angular construction and is pivoted, by means of a suitable pin 24, at the junction of its members to the said body B of the attachment within the said semicircular portion 12, as is illustrated in Fig. 2. That portion of the pointer which is adapted to travel over the scale 19 is much longer than the opposing portion, which is adapted for pivotal attachment to the link 22 on the actuating-bar 20.

A spring 25 is located within the chamber Z) of the body B of the attachment, being secured at the marginal portion of the segmental part 13 of the said body, and the said spring extends into that portion of the chamber which is within the semicircular part 12. The said spring at its free end engages with the end of the link 22, pivotally attached to the pointer 23. This spring 25 acts to normally force the actuating-bar 20 in direction of the other or opposing limb 26 of the calithe scale and indicate the measurement taken on the scale, so that the scale being read and the measurement noted it can be accurately determined whether other objects subse-v quently measured measure the same as the first one.

The moment that the calipers are moved from the object in connection with which they are used the pointer 23 is forced by the spring 25 to its normal position at one end of the scale and the actuating-bar 20 is restored to its normal position.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In calipers, a casing located outside of and secured to a limb of the calipers near its operating end, an exposed scale on a member of the casing, a tubular connection between the interior of the casing and the operating end of the said limb, constituting a terminal therefor, an actuating-bar having end movement in said tubular connection, and extending out beyond the engaging terminal face of the said limb, a pointer pivoted within the casing and adapted to travel over the said scale, a link connecting the inner end of the pointer with the corresponding end of the actuating-bar, and a spring confined within the casing and having bearing against the inner end of the said link, as described.

2. The combination With a leg of calipers, a connected tubular member extending from the contact end of said leg, and a casing connected with the tubular member and provided with a visible scale, of an actuating-bar held to slide in the said tubular member, a link connected with the actuating-bar and located within the said casing, a spring in the casing, exerting outward pressure on the link of the said actuating-bar, and a pointer adapted to traverse the exposed scale, Which pointer is pivoted in the said casing and is pivotally connected with the link of the actuating-bar, for the purpose described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses. I

CHARLES C. MOCLAUGHRY.

Witnesses:

H. B. COLLINS, N. P. MANSFIELD. 

